<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item
        v-for="(item, index) in internationalLevelList"
        v-if="item.meta.title"
        :key="item.path"
      >
        <span
          v-if="item.redirect === 'noredirect' || index == levelList.length - 1"
          class="no-redirect"
          >{{ $t(item.meta.title) || item.meta.title }}</span
        >
        <router-link v-else :to="item.redirect || item.path">{{
          $t(item.meta.title) || item.meta.title
        }}</router-link>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
import pathToRegexp from 'path-to-regexp';
import { hasNoneAsciiChar } from '@/utils/index';

export default {
  data() {
    return {
      levelList: null
    };
  },
  computed: {
    internationalLevelList() {
      const list = this.levelList;
      if (!list) return [];
      return list.map(t => ({
        ...t,
        meta: {
          ...(t.meta || {}),
          title: this.translateTitle(this.$pick('meta.title')(t))
        }
      }));
    }
  },
  watch: {
    $route() {
      this.getBreadcrumb();
    }
  },
  created() {
    this.getBreadcrumb();
  },
  methods: {
    translateTitle(title) {
      if (hasNoneAsciiChar(title)) return title;
      return this.$t(title);
    },
    getBreadcrumb() {
      const { params } = this.$route;
      let matched = this.$route.matched.filter(item => {
        if (item.name) {
          // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
          const toPath = pathToRegexp.compile(item.path);
          item.path = toPath(params);
          return true;
        }
      });
      const first = matched[0];
      if (first && first.name !== 'dashboard') {
        matched = [{ path: '/dashboard', meta: { title: '' } }].concat(matched);
      }
      this.levelList = matched;
    }
  }
};
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 10px;
  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
